|Speed Conrol of Separately Excited dc Motor using Fuzzy Technique|
This paper presents the speed control of a separately excited DC motor using Fuzzy Logic Control (FLC). The Fuzzy Logic Controller designed in this study applies the required control voltage based on motor speed error (e) and its change (ce). The performance of the driver system was evaluated through digital simulations using Simulink. The simulation results show that the control with FLC outperforms PI control in terms of overshoot, steady state error and rise time...
Keywords: DC motor; chopper; FLC
|Marathi Isolated Word Recognition System using MFCC and DTW Features|
This paper presents a Marathi database and isolated Word recognition system based on Mel-frequency cepstral coefficient (MFCC), and Distance Time Warping (DTW) as features. For the extraction of the feature, Marathi speech database has been designed by using the Computerized Speech Lab. The database consists of the Marathi vowels, isolated words starting with each vowels and simple Marathi sentences...
Keywords: CSL; MFCC; DTW; Spectrogram; Speech Recognition and statistical method
|Genetic Algorithm based Optimal Placement of Distributed Generation Reducing Loss and Improving Voltage Sag Performance|
This paper proposes a genetic algorithm optimization technique for optimal placement of distributed generation in a radial distribution system to minimize the total power loss and to improve the voltage sag performance. Load flow algorithm and three phase short circuit analysis are combined appropriately with GA, till access to acceptableresults of this operation. The suggested method is programmed under MATLAB software...
Keywords: Distributed Generation; Line Loss; Voltage Sag; Genetic Algorithm; and Radial Distribution network
|Design of UPQC with Minimization of DC Link voltage for the Improvement of Power Quality by Fuzzy Logic Controller|
Devices such as power electronics converters, inject harmonic currents in the AC system and increase overall reactive power demanded by the equivalent loads are presents non-linear characteristics. Also, the number of sensitive loads that require ideal sinusoidal supply voltages for their proper operation has increased. In order to keep power quality under limits proposed by standards, it is necessary to include some sort of compensation...
Keywords: unified power quality conditioner; fuzzy logic controller; powewr quality; dc link voltage
|Microcontroller Based Novel Dc-to-Ac Grid Connected Inverter Topology|
The conventional line commutated ac-to-dc converters/ inverters have square-shaped line current which contains higher-order harmonics. Moreover, it requires a costly and bulky dc inductor or choke. The line current with the high harmonic contents generates EMI and therefore itcauses more heating of the core of distribution or power transformers. Alternatively, PWM based inverters using MOSFET/IGBT switches can be used for the above purpose...
Keywords: grid connected inverter; total harmonic distortion (THD); simulink; line current
|Space Vector Pulse Width Modulation Schemes for Two-Level Voltage Source Inverter|
Space Vector Pulse Width Modulation (SVPWM) method is an advanced, computation intensive PWM method and possibly the best among all the PWM techniques for variable frequency drive applications. The SVPWM is an alternative method for the determination of switching pulse width and their position. The major advantage of SVPWM stem from the fact that, there is a degree of freedom of space vector placement in a switching cycle...
Keywords: SVPWM; 7-Segment SVM; 5-Segment SVM; Two -Level Inverter; SIMULINK
|Predicting the Future of Car Manufacturing Industry using Data Mining Techniques|
Data mining helps to find predictive information from large databases. Companies use predictive modeling tools for strategic decision-making. It helps companies to identify and account for the key assumptions that drive business value—enabling good decision making that leads to predictable results. By analyzing the company’s historical information we can anticipate these changes. This paper aims at providing a proposed data mining solution that can be used for automotive market, especially i...
Keywords: Data Mining; Predictive Modeling; Linear regression Analysis; WEKA
|Development of Switch Mode Dc Converter Using MATLAB/ dSPACE|
In this paper with the help of Matlab/Simulink and dSPACE, the Switch-Mode DC Converter is built in real-time to control the output voltage of the controller using PWM algorithm. First, the Simulink model of Switch-Mode DC Converter (i.e. Single-Pole and Two-Pole Converter Model) is built and, after verifying the results, it is implemented in real-time. Next, a DC motor is connected to the output terminals (i.e...
Keywords: Single-pole; Two-pole; dSPACE
|A New Soft-Switched Resonant DC-DC Converter|
This paper presents a new soft-switched resonant dcdc converter using a passive snubber circuit. The proposed converter uses a new zero voltage and zero current switching (ZVZCS) strategies to get ZVZCS function. Besides operating at constant frequency, all semiconductor devices operate at soft-switching without additional voltage and current stresses. In order to validate the proposed converter, computer simulations and experimental results were conducted...
Keywords: ZVZCS; resonant; converter; semiconductor; current switching; snubber
|A Novel Controller Based 48-Pulse STATCOM for Reactive Power Compensation and Voltage Stabilization in High Voltage Applications|
These paper presents the dynamic operation of a novel control scheme for Static Synchronous Compensator (STATCOM) based on a new full model comprising a 48-pulse Gate Turn-Off (GTO) thyristor voltage source converter for combined reactive power compensation and voltage stabilization of the electric grid network. The novel controllerfor the STATCOM presented in this paper is based on a decoupled strategy using the direct and quadrature components of the STATCOM current...
Keywords: 48-pulse GTO thyristor model STATCOM; novel decoupled control strategy; reactive compensation; voltage stabilization
|Image Denoising Techniques Preserving Edges|
The objective of this work is to propose an image denoising technique and compare it with image denoising using ridgelets. The proposed method uses slantlet transform instead of wavelets in ridgelet transform. Experimental result shows that the proposed method is more effective than ridgelets in noise removal. The proposed method is effective in compressing images while preserving edges.
Keywords: ridgelet; slantlet transform; image denoising; compression; huffman; edge
|Race Identification for Face Images|
Humans are able to process a face in a variety of ways to categorize it by its identity, along with a number of other demographic characteristics, including race, gender , and age. Experimental results are based on a face database containing subjects. Race and gender also play an important role in face-related applications. Experimental results are indicated that participants categorized the race of the faceand this categorization drives the perceptual process...
Keywords: race identification; PCA; face recognition
|Design of a 45nm TIQ Comparator for High Speed and Low Power 4-Bit Flash ADC|
The continued speed improvement of serial links and appearance of new communication technologies, such as ultra-wideband (UWB), have introduced increasing demands on the speed and power specifications of high-speed low-tomedium resolution analog-to-digital converters (ADCs).This paper presents the design of high speed and ultra low power comparator of a 4-bit ADC. The comparator used is Threshold Inverter Quantization (TIQ) consuming less than 145μW power with the input frequency of 1GHz and is...
Keywords: SoC; CMOS; ADC; TIQ
|Modeling, Analysis and Simulation of VFT for Power Flow Control through Asynchronous Power Systems|
Variable Frequency Transformer (VFT) is a controllable bi-directional transmission device that can transfer power between asynchronous networks. It avoids both HVDC link and FACTS based power transmission control system. Basically, it is a rotatory transformer whose torque is adjusted in order to control the power flow. In this paper, a simulated model of VFT is used as a controllable bidirectionalpower transmission device that can control power flow through the connected asynchronous power syst...
Keywords: Variable frequency transformer (VFT); MATLAB; Asynchronous power systems; Power flow
|Image Compression using WDR & ASWDR Techniques with different Wavelet Codecs|
In this paper, two different Wavelet based Image Compression techniques are compared. The techniques involved in the comparison process are WDR and ASWDR. The above two techniques are implemented with different types of wavelet codecs. Wavelet difference reduction (WDR) has recently been proposed as a method for efficient embedded image coding. This method retains all of the important features like low complexity, region of interest, embeddedness, and progressive SNR...
Keywords: Wavelet Image Compression; WDR; ASWDR
|Development and Simulation of Mathematical Modelling of Hydraulic Turbine|
Power system performance is affected by dynamic characteristics of hydraulic governor-turbines during and following any disturbance, such as occurrence of a fault, loss of a transmission line or a rapid change of load. Accurate modelling of hydraulic System is essential to characterize and diagnose the system response. In this article the mathematical modeling of hydraulic turbine is presented. The model is capable to implement the digital systems for monitoring and control replacing the convent...
Keywords: mathematical modeling; simulation; hydraulic turbine
|Efficient Optimal Sizing And Allocation Of Capacitors In Radial Distribution Systems Using Drdlf And Differential Evolution|
A distribution system is an interface between the bulk power system and the consumers. The radial distribution system is popular among these because of its low cost and simple design. The voltage instability in the power system is characterized by a monotonic voltage drop, which is slow at first and becomes abrupt after some time when the system is unable to meet the increasing power demand. Therefore to overcome these problems capacitors are used...
Keywords: Electrical Distribution Network; Optimal Capacitors Placement; Dimension reducing distribution load flow (DRDLF); Differential Evolution (DE) Algorithm
|FPGA Implementation of Large Area Efficient and Low Power Geortzel Algorithm for Spectrum Analyzer|
Spectrum analysis is very essential requirement in instrumentation and communication signal interception .Spectrum analysis is normally carried out by online or offline FFT processing. But the FFT being highly mathematical intensive, is not suitable for low area and low power applications. Offline FFT processing can’t give the real time spectrum estimation which is essential in communication signal interception...
Keywords: FFT; Goertzel algorithm; Spectrum Analysis; VHDL; XilinX ISE; Modelsim; Spartan 3E-FPGA board
|A PIC compatible RISC CPU core Implementation for FPGA based Configurable SOC platform for Embedded Applications|
Modern embedded systems are built around the soft core processors implemented on FPGA. The FPGAs being capable of implementing custom hardware blocks giving the advantage of ASICs, and allowing the implementation of processor platform are resulting in powerful Configurablesystem on chip(C-SoC)platforms. The Microchip’s PIC microcontroller is very widely used microcontroller architecture across various embedded systems...
Keywords: CPU; RISC; IP Core; IC; MXE; Xilix
|Detection of Transmission Line Faults by Wavelet Based Transient Extraction|
In this paper, a novel technique is applied to detect fault in the transmission line using wavelet transform. Three phase currents are monitored at both ends of the transmission line using global positioning system synchronizing clock. Wavelet transform, which is very fast and sensitive to noise, is used to extract transients in the line currents for fault detection. Fault index is calculated based on the sum of local and remote end detail coefficients and compared with threshold value to detect...
Keywords: Wavelet transform; transmission line faults; power system protection; fault transients; multiresolution analysis
|TCAD Based Analysis of Gate Leakage Current for High-k Gate Stack MOSFET - Ides Editor|
Scaling of metal-oxide-semiconductor transistors to smaller dimensions has been a key driving force in the IC industry. This work analysis the gate leakage current behavior of nano scale MOSFET based on TCAD simulation. The Sentaurus Simulator simulates the high-k gate stack structure of N-MOSFET for analysis purpose. The impact of interfacial oxide thickness on the gate tunneling current has been investigated as a function of gate voltages for a given equivalent oxide thickness (EOT) of 1.0 nm...
Keywords: MOESFET; inelastic trap assisted tunnelling; gate tunneling current; High-k stack
|An Area Efficient, High Performance, Low Dead Zone, Phase Frequency Detector in 180 nm CMOS Technology for Phase Locked Loop System - R. H. Talwekar, Dr. S. S. Limaye|
The phase frequency detector has been designed for high frequency phase locked loop in 180 nm CMOS Technology with 1.8V supply voltage using CADENCE Spectre tool. A Virtuoso Analog Design Environment and Virtuoso LayoutXL tools of Cadence have used to design and simulate schematic and layout of phase frequency detector respectively. Architecture of phase frequency detector (PFD) has simulated to get low dead zone and low power consumption...
Keywords: Phase locked loop (PLL); Phase frequency detector (PFD); Charge pump (CP); Voltage controlled oscillator (VCO); Dead Zone; Low pass filter (LPF); and D flip flop (DFF)
|Analysis of Software Complexity Measures for Regression Testing|
Software metrics is applied evaluating and assuring software code quality, it requires a model to convert internal quality attributes to code reliability. High degree of complexity in a component (function, subroutine, object, class etc.) is bad in comparison to a low degree of complexity in a component. Various internal codes attribute which can be used to indirectly assess code quality. In this paper, we analyze the software complexity measures for regression testing which enables the tester/d...
Keywords: Software Complexity; Software Metrics; Regression Testing; Control Flow Metrics1
|Harmonic Minimization In Multilevel Inverters By Using PSO|
Harmonic Elimination in a multilevel inverters is an optimization problem which is solved by applying particle swarm optimization (PSO) technique. The derived equation for the computation of total harmonic distortion (THD) of the output voltage of the multilevel inverter is used as the objective function in PSO algorithm. The objective function used is to reduce the THD of the multilevel inverter and obtain the corresponding switching angles with the elimination of possible lower order harmonics...
Keywords: selective harmonic elimination(SHE); particle swarm optimization(PSO); Total harmonic distortion(THD)
|Prototyping a Wireless Sensor Node using FPGA for Mines Safety Application|
The sensor nodes in a wireless sensor network are normally microcontroller based which are having limited computational capability related to various applications. This paper describes the selection, specification and realization of a wireless sensor node using the field programmable gate array (FPGA) based architecture for an early detection of hazards (e.g fire and gas-leak ) in mines area. The FPGAs in it’s place are more efficient for complex computations in compare to microcontrollers, wh...
Keywords: Wireless Sensor Network (WSN); system on programmable chip (SOPC); FPGA
|Towards a Software Framework for Automatic Business Process Redesign - Marwa M.Essam, Selma Limam Mansar|
A key element to the success of any organization is the ability to continuously improve its business process performance. Efficient Business Process Redesign (BPR) methodologies are needed to allow organizations to face the changing business conditions. For a long time, practices for BPR were done case-by-case and were based on the insights and knowledge of an expert to the organization. It can be argued that efficiency, however, can further be achieved with the support of automatic process re...
Keywords: Process Mining; Business Process Redesign; Business Process Management
|FIR Filter Design using Particle Swarm Optimization with Constriction Factor and Inertia Weight Approach|
This paper presents an alternative approach for the design of linear phase digital low pass FIR filter using Particle Swarm Optimization with Constriction Factor and Inertia Weight Approach (PSO-CFIWA). FIR filter design is a multimodal optimization problem. The conventional gradient based optimization techniques are not efficient for digital filter design. Given the filter specification to be realized, PSO algorithm generates a set of filter coefficients and tries to meet the ideal frequency ch...
Keywords: FIR Filter; PSO; GA; Optimization; Magnitude Response; Convergence; Low Pass Filter
|Simulation Studies of Shunt Passive Harmonic Filters: Six Pulse Rectifier Load – Power Factor Improvement and Harmonic Control|
This paper presents a study of harmonic filters design procedure to minimize harmonic distortion caused by a harmonic source such as drives. The non – linear load considered in this paper is six pulse rectifier load. Design and simulation procedure with respect to this load is explained in details. Several types of shunt harmonic filters are presented. Shunt filters are effective in minimizing voltage distortion caused by nonlinear loads in industrial power systems...
Keywords: Harmonics; passive shunt filters; single tuned filter; high pass filter; filter rating
|A Refined Space Vector PWM Signal Generation for Multilevel Inverters|
A refined space vector modulation scheme for multilevel inverters, using only the instantaneous sampled reference signals is presented in this paper. The proposed space vector pulse width modulation technique does not require the sector information and look-up tables to select the appropriate switching vectors. The inverter leg switching times are directly obtained from the instantaneous sampled reference signal amplitudes and centers the switching times for the middle space vectors in a samplin...
Keywords: dual-fed induction motor; space vector PWM; sampled sinusoidal reference signals; triangular carrier signals; middle space vectors
|Small Signal Stability Improvement and Congestion Management Using PSO Based TCSC Controller|
In this paper an attempt has been made to study the application of Thyristor Controlled Series Capacitor (TCSC) to mitigate small signal stability problem in addition to congestion management of a heavily loaded line in a multimachine power system. The Flexible AC Transmission System (FACTS) devices such as TCSC can be used to control the power flows in the network and can help in improvementof small signal stability aspect...
Keywords: Congestion management; Particle Swarm Optimization; Small Signal Stability; Thyristor Controlled Series Compensator; Transmission Line Flow Sensitivity
|Waste from Food Industry and their Disposal: Some Facts - IDES editor|
Due to increasing industrialization quantity of waste water is increasing at alarming rate while compositions of such waste are being more and more complex. Disposal of such waste must follow suitable treatments so that qualities of effluent for disposal follow requisite standards. Such Standards for effluent are discussed and a case study for a beverage producing plant is reported.
Keywords: industrial waste; eco-friendly disposal; effluent standards; law enforcement; waste minimization
|Profit based unit commitment for GENCOs using Parallel PSO in a distributed cluster|
In the deregulated electricity market, each generating company has to maximize its own profit by committing suitable generation schedule termed as profit based unit commitment (PBUC). This article proposes a Parallel Particle Swarm Optimization (PPSO) solution to the PBUC problem. This method has better convergence characteristics in obtaining optimum solution. The proposed approach uses a cluster of computers performing parallel operations in a distributed environment for obtaining the PBUC s...
Keywords: deregulated market; profit based unit commitment; particle swarm optimization; distributed environment; parallel processing; parallel particle swarm optimization
|Customized Dynamic Host Configuration Protocol - Mr. Sadananda M P and Mr. Sudeep Manohar|
The Dynamic Host Configuration Protocol (DHCP) provides a framework for passing configuration information to hosts on a UDP network. Computers that are connected to IP networks must be configured before they can communicate with other hosts. The most essential information needed is an IP address. DHCP eliminates the manual task by a network administrator. DHCP is based on the Bootstrap Protocol (BOOTP), adding the capability of automatic allocation of reusable network addresses and additional co...
Keywords: DHCP; BOOTP; DORA; Lease file; security; CUnit; TCP; UDP and IP address
|Loss Reduction by Optimal Placement of Distributed Generation on a Radial feeder|
Due to the increasing interest on renewable sources in recent times, the studies on integration of distributed generation to the power grid have rapidly increased. In order to minimize line losses of power systems, it is crucially important to define the location of local generation to be placed. Proper location of DGs in power systems is important for obtaining their maximum potential benefits. This paperpresents analytical approaches to determine the optimal location to place a DG on radial sy...
Keywords: Analytical approach; distributed generation; radial systems; optimal placement; power loss
|Design And Performance of Finite impulse Response Filter Using Hyperbolic Cosine Window - Harish Kumar, Piyush Kumar and Kaushal Kumar,Venkat babu G|
In this paper a proposed of design and analysis of Finite impulse response filter using Hyperbolic Cosine window (Cosh window for short). This window is very useful for some applications such as beam forming, filter design, and speech processing. Digital FIR filter designed by Kaiser window has a better far-end stop-band attenuation than filter designed by the other previously well known adjustable windows such as Dolph-Chebyshev and Saramaki, which are special cases of Ultraspherical windows, b...
Keywords: Digital FIR filter; far-end stopband attenuation; side-lobe roll-off ratio; window technique; Kaiser Window; Hyperbolic Cosine window
|New Model Variable Frequency Transformer (NMVFT) – A Technology for V/f Control of Induction Motors|
Variable frequency transformer (VFT) is used as a controllable bidirectional transmission device that can transfer power between asynchronous networks and functionally is similar to back-to-back HVDC. This paper describes the basic concept of a New Model Variable Frequency Transformer (NMVFT). NMVFT is a new technology which is used for v/f control of induction motors. A digital simulation model of NMVFT and its control system are developed using MATLAB...
Keywords: Variable frequency transformer (VFT); Asynchronous; New Model Variable Frequency Transformer (NMVFT); V/f control; MATLAB
|Dynamic Spectrum Derived Mfcc and Hfcc Parameters and Human Robot Speech Interaction|
Using the Mel-frequency cepstral coefficients (MFCC), Human Factor cepstral coefficients (HFCC) and their new parameters derived from log dynamic spectrum and dynamic log spectrum, these features are widely used for speech recognition in various applications. But, speechrecognition systems based on these features do not perform efficiently in the noisy conditions, mobile environment and for speech variation between users of different genders and ages...
Keywords: MFCC; HFCC; HMM; HOAP-2
|Evolutionary Algorithmical Approach for VLSI Physical Design- Placement Problem|
Physical layout automation is very important in VLSI’s field. With the advancement of semiconductor technology, VLSI is coming to VDSM (Very Deep Sub Micrometer), and the scale of the random logic IC circuits goes towards million gates. Physical design is the process of determining the physical location of active devices and interconnecting them inside the boundary of the VLSI chip.The earliest and the most critical stage in VLSI layout design is the placement...
Keywords: Placement problems; Memetic algorithm; wire length minimization; area minimization
|Realization of Current-mode Quadrature Oscillator Based on Third Order Technique|
This article presents a 3rd current-mode quadrature oscillator using current controlled current conveyor transconductance amplifier (CCCCTA) and operational transconductance amplifier (OTA) as active element as active elements. The proposed circuit is realized from a noninverting lossless integrator and an inverting second orderlow-pass filter. The oscillation condition and oscillation frequency can be electronically/orthogonally controlled via input bias currents...
Keywords: oscillator; current-mode; CCCCTA; OTA
|The Analysis of Dead Time on Switching Loss in High and Low Side MOSFETs of ZVS Synchronous Buck Converter|
This work is about the analysis of dead time variation on switching losses in a Zero Voltage Switching (ZVS) synchronous buck converter (SBC) circuit. In high frequency converter circuits, switching losses are commonly linked with high and low side switches of SBC circuit. They are activated externally by the gate driver circuit. The duty ratio, dead time and resonant inductor are the parameters that affect the efficiency of the circuit...
Keywords: PSpice Simulation; Resonant Gate Driver; Synchronous Buck Converter; Switching Losses
|Energy Efficient and Process Tolerant Full Adder in Technologies beyond CMOS - Aminul Islam, M. W. Akram, Mohd. Hasan|
This paper presents 1-bit full adder cell in emerging technologies like FinFET and CNFET that operates in the moderate inversion region for energy efficiency, robustness and higher performance. The performance of the adder is improved by the optimum selection of important process parameters like oxide and fin thickness in FinFET and number of carbon nanotubes, chirality vector and pitch in CNFET. The optimized CNFET-based full adder (OP-CNFET) has higher speed, lower PDP (power-delay product) an...
Keywords: Variability; power-delay product (PDP); moderate inversion region (MIR); optimized FinFET-based full adder (OP-FinFET); optimized CNFET-based full adder (OP-CNFET)
|Static Synchronous Series Compensator (SSSC) with Superconducting Magnetic Energy Storage (SMES) for the Enhancement of Transient Stability in Multi- Area System|
Static Synchronous Series Compensator (SSSC) has been designed with Superconducting Magnetic Energy Storage (SMES) system. A closed loop control scheme has been proposed with PI controller and real and reactive powers are taken as references. A 48 pulse voltage source inverter is designed for the SSSC. Control scheme for the chopper circuit of SMES coil is also designed. A three area system is taken as the test system and the operation of SSSC with SMES is analysed for various transient disturba...
Keywords: SSSC; SMES; Transient stability; voltage source inverter; closed loop control
|A Novel Fuzzy Variable-Band Hysteresis Current Controller For Shunt Active Power Filters|
This paper presents a novel fuzzy control scheme applied to shunt active power filters for harmonic and reactive power compensation. A TSK type fuzzy logic controller is proposed for APF reference current generation. To control the maximum switching frequency of the converter within limit a novel fuzzy hysteresis band current controller is used. The band height, based on fuzzy control principle is changedwith the value of supply voltage and slope of reference current...
Keywords: active power filter; nonlinear load; TSK type fuzzy controller; harmonics; indirect current control scheme
|Pentacene-Based Organic Field-Effect Transistors: Analytical Model and Simulation Methods versus Experiment Data|
Organic Field-Effect Transistors, OFETs, attract much interest recently and their proficiency and hence applications are being enhanced increasingly. However, only analytical model of old field-effect transistors, developed for silicon-based transistors, and their relevant numerical analyses have been used for such devices, so far. Increasingprecision of such models and numerical methods are essential now in order to modify OFETs and propose more effective models and methods...
Keywords: Organic Field-Effect Transistors; IEEE1620; Pentacene; ATLAS (Silvaco) simulator
|Built-in Self Repair for SRAM Array using Redundancy - A. Padma Sravani, Dr. M. Satyam|
In this paper, a built-in self repair technique for word-oriented two-port SRAM memories is presented. The technique is implemented by additional hardware design instead of traditional software diagnostic procedures and the computation time is minimized. A built-in self-test (BIST) is used to detect the faulty locations which are isolated immediately after detection. Therefore, the redirection process can be executed as soon as possible...
Keywords: SRAM; two-port memories; PVT faults; fault isolation; BISR
|Performance analysis of Multiband - OFDM systems using LDPC coder in pulsed - OFDM modulation for UWB communications|
In this paper, a combined approach where low density parity check (LDPC) codes are used to reduce the complexity and power consumption of pulsed orthogonal frequencydivision multiplexing (pulsed-OFDM) ultra-wideband (UWB) systems is described. The proposed system uses LDPC codes to achieve higher code rates without using convolution encoding and puncturing thereby reducing the complexity and power consumption of pulsed-OFDM system...
Keywords: Low Density Parity Check (LDPC); pulsed orthogonal frequency-division multiplexing (pulsed-OFDM); orthogonal frequency-division multiplexing (OFDM); LDPCpulsed- OFDM; ultra-wideband (UWB); digital video broadcasting-satellite-second generation (DVB-S2); wireless personal area networks (WPAN)
|A New Active Snubber Circuit for PFC Converter|
In this paper, a new active snubber circuit is developed for PFC converter. This active snubber circuit provides zero voltage transition (ZVT) turn on and zero current transition (ZCT) turn off for the main switch without any extra current or voltage stresses. Auxiliary switch turns on and off with zero current switching (ZCS) without voltage stress. Although there is a current stress on the auxiliary switch, it is decreased by diverting it to the output side with coupling inductance...
Keywords: Power factor correction (PFC); soft switching (SS); ZCS; ZCT; and ZVT
|Silicon Photonics: A Solution for Ultra High Speed Data Transfer - Pratik Ganguly, Rahul .S|
Silicon photonics is the integration of integrated optics and photonics IC technologies in silicon. Silicon photonics has recently attracted a great deal of attention since it offers an opportunity for low cost solutions for various applications ranging from telecommunications to chip-chip inter connects. Two keys to this advancement are the increased speed of communications (now at the speed of light) and the increased amount of data that can be transmitted at once (i.e., bandwidth)...
Keywords: silicon photonics; Light source; silicon waveguide; silicon modulator; Photo detector; indirect band gap; compatibility-quad; gallium nitride
|Resilient Characteristics of Stone Matrix Asphalt Mixes - Ides Editor|
Stone Matrix Asphalt (SMA) is a gap graded mix, characterized by high coarse aggregates, high asphalt contents and polymer or fiber additives as stabilizers. In comparison to dense graded mixtures SMA has higher proportion of coarse aggregate, lower proportion of middle size aggregate and higher proportion of mineral filler. It resists permanent deformation and has the potential for long term performance and durability...
Keywords: stone matrix asphalt; coconut fibre; repeated load indirect tensile test
|Effect of Superplasticizer and Silica Fume on Properties of Concrete - Ides Editor|
Nowadays high strength and high performance concrete are widely used in many civil engineering constructions. To produce them it is required to reduce the water/powder ratio and increase the binder content. Superplasticizers are commonly used to achieve the workability. Silica fume is one of the popular pozzolanas used in concrete to get imporved properties. The use of silica fume in conjuction with superplastisizers has become the backbone of high strength and high performance concrete...
Keywords: high strength concrete; high performance concrete; superplastcizer; silica fumeI